Did you watch the video? I just watched it because you made me think I was bats.
There was no nasty scene. The man was sitting quietly in his seat. A guy, not in uniform came up, reached over, bodily lifted him out of his seat. The passenger started to scream as he was manhandled, passengers head hit the seat rest and he was dragged lifelessly up the aisle.
https://www.nytimes.com/2017/04/11/world/asia/united-airlines-passenger-dragged-china.html?_r=0